DTC C1A52: Driving Support ECU Communication Abnormal [10/2017 - 09/2020]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2016 - 09/2020]

   Powertrain > Radar Cruise > Clear DTCs 

2. Perform the following to make sure that the DTC detection conditions are met.

   HINT: 

   If the following conditions are not met, the system cannot detect the malfunction.

   1. Turn the engine switch on (IG).
   2. Wait for 20 seconds or more.
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2016 - 09/2020]

   Powertrain > Radar Cruise > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1A52 is not output	A
   DTC C1A52 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2020] 

Result: 

B 

See step  2

1. Replace the ECM with a new one.

   for 2GR-FKS: Refer to REMOVAL [10/2017 - ]

   for 8AR-FTS: Refer to REMOVAL [08/2015 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2016 - 09/2020]

   Powertrain > Radar Cruise > Clear DTCs 

2. Perform the following to make sure that the DTC detection conditions are met.

   HINT: 

   If the following conditions are not met, the system cannot detect the malfunction.

   1. Turn the engine switch on (IG).
   2. Wait for 20 seconds or more.
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2016 - 09/2020]

   Powertrain > Radar Cruise > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1A52 is not output	A
   DTC C1A52 is output	B

Result: 

A 

END (ECM WAS DEFECTIVE) 

Result: 

B 

REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to  COMPONENTS [04/2013 - 09/2020]